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Inverse problem in beam bending, elastic-ideally plastic material

Submitted by Frank Richter on
inverse problem
beam bending
elastic-ideally plastic material

Dear iMechanica,





suppose you have a beam with a square cross-section, manufactured from an elastic-ideally plastic material.



Now apply a load that rises linearly in time, but is locally constant along the beam length. Upon sagging, the beam will develop a plastic zone beginning in the top and surface regions at mid-length.

This is the "straight" problem solved in Prager, Hodge: Theory of perfectly plastic solids, publisher: Springer



Delamination and Cohesive zone model

Submitted by Anonymous (not verified) on
research

 

I want to work on delamination and cohesive zone model. I would also like to model this in Abaqus. I’ve read the material available there but it’s not adequate. I would like to know the concepts and fundamentals of the cohesive zone model and its implementation. Can anyone explain this? Please suggest some good literature/books on this for beginners.

Praveen.

 

Siple Compression Test With Abaqus Explicit

Submitted by gnoij on
VUMAT
simple compresion test

Hi, i am trying to test a bulk metallc glass VUMAT with a simple compression test simulation. But since VUMAT is a Abaqus Explicit subroutine, that means I must set my compression simulation with setting of Abaqus Explicit right? So far I only have the experience in conducting compression test simualtion using ABAQUS Standard setting like static general step and surface-to-surface contact (standard). I don't know how to set up a simple compression test simulation with Abaqus Explicit settings, can anyone help me please?

Thanks and regards. 

Discussion of fracture paper #2 - The role of the T-stress

Submitted by ESIS on
crack extension
T-stress

J.C. Sobotka, R.H. Dodds: Steady crack growth in a thin, ductile plate under small-scale yielding conditions: Three-dimensional modelling., Engineering Fracture Mechanics, Vol. 78, 2011, pp. 343-363; J.C. Sobotka, R.H. Dodds: T-stress effects on steady crack growth in a thin, ductile plate under small-scale yielding conditions: Three-dimensional modelling., Engineering Fracture Mechanics, Vol. 78, 2011, pp. 1182-1200. 

To the discussion

CISM Course: Advanced and Bio-Inspired Nanomechanics

Submitted by Huajian Gao on

Hi all,

There will be a 5 day - course on Advanced and Bio-Inspired Nanomechanics at CISM Udine, Italy.

http://www.cism.it/courses/C1107/

http://media.cism.it/courses%2FC1107%2FPugno4___.pdf

- HG





PS. Original flyer on CISM website:

Advanced and Bio-Inspired Nanomechanics

July 18, 2011 — July 22, 2011

Coordinator:

Crack Initiation with UMAT

Submitted by Panos Efthymiadis on
research
Plasticity
crack initiation-propagation

Dear all,

      I want to model crack initiation and propagation for a user defined material, using Abaqus. When I try to model , I get the following error:

A MATERIAL PROPERTY THAT IS NOT ALLOWED WITH A USER MATERIAL HAS BEEN SPECIFIED

when I take out critical damage initiation, the model works fine; which means that it doesnt allow me to couple UMAT with crack initiation. Does anyone know how to handle this problem?

All the best,

         Panos

 

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